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Did your customer purchased a VS subscription or the license like a 5x5 activation key?

If your customer have a 5x5 activation key, please open VS pro and go to Help-Register Product, directly enter the product
key to unlock it.

If your customer purchased a VS subscription through the Microsoft Store, we can follow
this to activate your subscription, go to Help-Register Product and sign in with the email address that associated to the Visual Studio subscription to unlock VS.

Best regards,

Sara

MSDN Community Support Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be beneficial to other community members reading this thread. If you have any compliments
or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com

Have your customer already successfully activate the VS? If not, please feel free to let us know, we will help he research again.

Best regards,

Sara

MSDN Community Support Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be beneficial to other community members reading this thread. If you have any
compliments or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com